The only viable way to determine accurately how many active members there are is:
1. Pick ONE month in a year. Only ONE month. This month should be the same month every year, consistingly. (This is actually the methodology adopted by the census. They take a "snapshot" of ONE day.) Not the peak month in a year, but the same month every year. I would suggest May, since it's not overly affected yet by school holidays and the Memorial "fever" is gone, and the campaign for the DC still hasn't started.
2. Then, measure in that month how many have reported field service.
3. From that figure, determine:
Growth rate (positive or negative) since same month the previous year.
How many of those who reported are baptized. Again, measure that igure against last year's figure.
How many in that congregation are irregular that month.
How many in the congregation are inactive in that month.
Percentage of baptized active members versus population
Percentage of active publishers versus population.
Only when you have the "snapshot approach" you can get accurate results.
PS. Been sick, haven't been able to follow up or participate much lately.